// Preloads
var a1 = new Image () ; a1.src = "images/base1/onglet_on.gif" ;
var a2 = new Image () ; a2.src = "images/base1/bandeau_gauche_on.gif" ;
var a3 = new Image () ; a3.src = "images/base1/bandeau_droite_on.gif" ;
var a4 = new Image () ; a4.src = "images/base1/menu_2l_on.gif" ;
var a5 = new Image () ; a5.src = "images/base1/menu_3l_on.gif" ;
var a6 = new Image () ; a6.src = "images/base1/menu_haut_on.gif" ;
var a7 = new Image () ; a7.src = "images/base1/menu_haut_on.gif" ;